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Butane blending is an important contributor to profits generated in refineries and in the pipeline. By adding exact quantities of Butane to finished gasoline, a considerable amount of cost savings can be realized year by year. Before, during and after blending, one important specification has to be considered at all times: Regulations limit the vapor pressure of gasolines and Butane has a considerably higher vapor pressure than gasoline. While blending can be performed throughout the year, a window of opportunity for Butane blending is generated when the weather gets cooler and the limits for vapor pressure are increased.